Skip to content

Today's Offers

Click offer codes below to apply in checkout. Tap offer codes below to apply in checkout.

There are no promotions running at this time. There are no promotions running at this time.

SHOP NOW, SAVE LATER: Spend $75.00 or more at Merrell.com through 12/31/2024 and get $25.00 towards your future purchase of $75.00 or more. Code will be sent via email on 11/14/2024. Limit one code per customer during the duration of the promotion. Offer redeemable 11/14/2024 through 1/31/2025. Cannot be combined with any other offer. Not valid on canceled orders, ProDeal purchases, prior purchases, gift cards or e-cards or purchases from retail stores or other websites. Offer may change at any time. Valid on U.S. orders only. Some restrictions may apply.

No Code Necessary

details

$20 OFF YOUR ORDER OF $100+: $20 off your order at merrell.com when you refer a friend to merrell.com and they make a qualifying purchase. Your friend will receive a $20 promo code to use on their first purchase of $100+ at merrell.com. Please read all terms and conditions. Offer valid on US orders only. Not valid on Prodeal purchases, select full priced styles, prior purchases, gift cards or e-cards, or purchases from retail stores or other websites. Cannot be combined with any other coupon or discount.

No Code Necessary

details

No Code Necessary

Your browser's Javascript functionality is turned off. Please turn it on so that you can experience the full capabilities of this site.

Women's Siren 4 Thermo Demi Waterproof

$160.00

Siren 4 Thermo Demi Waterproof, Black, dynamic 1

Siren 4 Thermo Demi Waterproof, Black, dynamic 2

Siren 4 Thermo Demi Waterproof, Black, dynamic 3

Siren 4 Thermo Demi Waterproof, Black, dynamic 4

Siren 4 Thermo Demi Waterproof, Black, dynamic 5

Siren 4 Thermo Demi Waterproof, Black, dynamic 6

Siren 4 Thermo Demi Waterproof, Black, dynamic 1

Siren 4 Thermo Demi Waterproof, Black, dynamic 2

Siren 4 Thermo Demi Waterproof, Black, dynamic 3

Siren 4 Thermo Demi Waterproof, Black, dynamic 4

Siren 4 Thermo Demi Waterproof, Black, dynamic 5

Siren 4 Thermo Demi Waterproof, Black, dynamic 6

Women's Siren 4 Thermo Demi Waterproof

$160.00

Select a Type

Wide Width

Wide Width

{"attributes":["size","width"],"inventory":[{"id":"195017984242","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984259","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984266","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984273","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984280","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984297","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984303","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984310","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984327","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984334","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984341","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984358","quantity":0,"status":"NOT_AVAILABLE"},{"id":"195017984365","quantity":0,"status":"NOT_AVAILABLE"}],"variations":{"195017984242":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"5","sizeDisplayValue":"5","width":"M","widthDisplayValue":"M"},"195017984259":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"5.5","sizeDisplayValue":"5.5","width":"M","widthDisplayValue":"M"},"195017984266":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"6","sizeDisplayValue":"6","width":"M","widthDisplayValue":"M"},"195017984273":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"6.5","sizeDisplayValue":"6.5","width":"M","widthDisplayValue":"M"},"195017984280":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"7","sizeDisplayValue":"7","width":"M","widthDisplayValue":"M"},"195017984297":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"7.5","sizeDisplayValue":"7.5","width":"M","widthDisplayValue":"M"},"195017984303":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"8","sizeDisplayValue":"8","width":"M","widthDisplayValue":"M"},"195017984310":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"8.5","sizeDisplayValue":"8.5","width":"M","widthDisplayValue":"M"},"195017984327":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"9","sizeDisplayValue":"9","width":"M","widthDisplayValue":"M"},"195017984334":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"9.5","sizeDisplayValue":"9.5","width":"M","widthDisplayValue":"M"},"195017984341":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"10","sizeDisplayValue":"10","width":"M","widthDisplayValue":"M"},"195017984358":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"10.5","sizeDisplayValue":"10.5","width":"M","widthDisplayValue":"M"},"195017984365":{"isAvailable":false,"isComingsoon":false,"discontinuedflag":true,"color":"J036750","size":"11","sizeDisplayValue":"11","width":"M","widthDisplayValue":"M"}},"color":{"attributeID":"color","displayName":"Color","ID":"color","values":[{"ID":"J036750","displayValue":"Black","value":"J036750","description":null}]},"size":{"attributeID":"size","displayName":"Size","ID":"size","values":[{"ID":"5","displayValue":"5","value":"5","description":null},{"ID":"5.5","displayValue":"5.5","value":"5.5","description":null},{"ID":"6","displayValue":"6","value":"6","description":null},{"ID":"6.5","displayValue":"6.5","value":"6.5","description":null},{"ID":"7","displayValue":"7","value":"7","description":null},{"ID":"7.5","displayValue":"7.5","value":"7.5","description":null},{"ID":"8","displayValue":"8","value":"8","description":null},{"ID":"8.5","displayValue":"8.5","value":"8.5","description":null},{"ID":"9","displayValue":"9","value":"9","description":null},{"ID":"9.5","displayValue":"9.5","value":"9.5","description":null},{"ID":"10","displayValue":"10","value":"10","description":null},{"ID":"10.5","displayValue":"10.5","value":"10.5","description":null},{"ID":"11","displayValue":"11","value":"11","description":null}]},"width":{"attributeID":"width","displayName":"Width","ID":"width","values":[{"ID":"M","displayValue":"M","value":"M","description":"Medium"}]}}

Size

Size Chart

Size Guide

Women's Footwear Size Chart
US Women's Size	UK	EU	JPN (cm)	US Men's Conversion
5	2.5	35	22	3.5
5.5	3	35.5	22.5	4
6	3.5	36	23	4.5
6.5	4	37	23.5	5
7	4.5	37.5	24	5.5
7.5	5	38	24.5	6
8	5.5	38.5	25	6.5
8.5	6	39	25.5	7
9	6.5	40	26	7.5
9.5	7	40.5	26.5	8
10	7.5	41	27	8.5
10.5	8	42	27.5	9
11	8.5	42.5	28	9.5
11.5	9	43	28.5	10

Use your PayPal Account

Please select Size and Width

With 25 years of Merrell's women's-specific fit, the Siren 4 Thermo is uniquely engineered to cradle the distinct contours of female feet, providing comfort, support, and stability even on the longest hikes with added insulation for warmth and protection.

FEATURES
• Waterproof membrane seals out water and lets moisture escape
• Protective shell keeps feet dry
• Waterproof suede leather upper
• 100% recycled laces and webbing
• Bellows tongue keeps out debris
• 100% recycled fleece lining
• 100 grams Primaloft® Gold Eco Series synthetic insulation
• Rock plate for protection
• FloatPro™ Foam midsole for lightweight comfort that lasts
• Vibram® Icetrek outsole designed to provide the improved grip on very cold, icy, or snowy surfaces
• Drop: 8mm
• Lug: 5mm

See all reviews